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SubjectRe: possible deadlock in sch_direct_xmit
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syzbot has bisected this bug to:

commit c84bed440e4e11a973e8c0254d0dfaccfca41fb0
Author: Xin Long <lucien.xin@gmail.com>
Date: Sun Oct 1 14:00:56 2017 +0000

ip_gre: erspan device should keep dst

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=153a767ee00000
start commit: c92a9a46
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=173a767ee00000
console output: https://syzkaller.appspot.com/x/log.txt?x=133a767ee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=46986c099cb53bc6
dashboard link: https://syzkaller.appspot.com/bug?extid=29cc278357da941e304e
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=143636c9800000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16856849800000

Reported-by: syzbot+29cc278357da941e304e@syzkaller.appspotmail.com
Fixes: c84bed440e4e ("ip_gre: erspan device should keep dst")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

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